I am creating a computed column using CASE expression where I will automatically calculate the value of a column based on the value of other columns: The psuedocode is as follows: If the Quantity of items ordered is in between 10 and 20, give a 10 discount.
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The CASE statement will translate the code in the TYPE column into the text that we desire.ĬASE statements are very powerful and you should use them when you can to create elegant and optimal SQL in your DB2 applications. Here’s a practical example of using CASE expression in SQL Server. This new query will need to scan SYSTABLES only once. But, you can use CASE and code an equivalent, but more efficient query, as follows: To do this, DB2 must scan through the table three times – once for each query (as there is no index on the TYPE column). The report shows all of the DB2 table-like objects that exist in the DB2 subsystem: tables, views, and synonyms. This simple SQL statement uses UNION to put together the results of three queries against the SYSTABLES table.
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Unlike IFELSE, where only the maximum of one condition is allowed, CASE allows the user to apply multiple conditions to perform different sets of actions in MS SQL. The CASE statement can potentially enhance performance by minimizing the number of times the data is read. CASE Statement in SQL Server is the extension of IFELSE statement. This is very useful, particularly when the data for each of the queries in the UNION come from the same table. When a UNION is required to put together data from multiple queries, you might be able to use a CASE statement instead.
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